CN109995044A - The double-closed-loop control method of power network neutral point displacement voltage active quenching - Google Patents
The double-closed-loop control method of power network neutral point displacement voltage active quenching Download PDFInfo
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000010791 quenching Methods 0.000 title claims abstract description 8
- 230000000171 quenching effect Effects 0.000 title claims abstract description 8
- 238000002347 injection Methods 0.000 claims abstract description 47
- 239000007924 injection Substances 0.000 claims abstract description 47
- 230000001629 suppression Effects 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims description 26
- 239000003990 capacitor Substances 0.000 claims description 14
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- 238000005070 sampling Methods 0.000 claims description 4
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- 230000005764 inhibitory process Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 15
- 239000004020 conductor Substances 0.000 description 10
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- 241000208340 Araliaceae Species 0.000 description 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 2
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- 239000013068 control sample Substances 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005350 ferromagnetic resonance Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
A kind of double-closed-loop control method of power network neutral point displacement voltage active quenching, belongs to Power System Analysis, operation and power quality harnessed synthetically technical field.The purpose of the present invention is control active inversion device to the double-closed-loop control method for by way of neutral point Injection Current, inhibiting the raised power network neutral point displacement voltage active quenching of neutral point displacement voltage caused by line-to-ground parameter unbalance and investment arc suppression coil.The invention proposes a kind of double-closed-loop control methods of 66kV power network neutral point displacement voltage active quenching, control active inversion device to by way of neutral point Injection Current, the neutral point displacement voltage caused by line-to-ground parameter unbalance and investment arc suppression coil is inhibited to increase, double-closed-loop control is controlled using outer voltage PR, current inner loop PI control, outer voltage is control target with neutral point voltage, current inner loop is control target with Injection Current, pass through the real-time adjusting to Injection Current, guarantee the accuracy of Injection Current, validity, realize effective inhibition to neutral point displacement voltage.
Description
Technical field
The invention belongs to Power System Analysis, operation and power quality harnessed synthetically technical fields.
Background technique
China's medium voltage distribution network generally by through arc suppression coil or it is earth-free in a manner of based on, in isolated neutral system, due to frame
The reasons such as empty Conductor transposition is not good enough, appearance of the power distribution network with high-voltage load, ferromagnetic resonance will lead to the mutual of three relatively parameters
It is unequal, so that there is asymmetrical voltage in neutral point.
Neutral point voltage-to-ground and earthing mode are closely related, to guarantee power supply reliability and extinguishing fault electric arc,
Most of medium voltage distribution networks use high resistance grounding and resonance neutral grounding, and arc suppression coil generation series resonance can make neutral point
Voltage-to-ground increases.
The method that the suppressing method of existing power network neutral point displacement voltage mainly uses switching coupling capacitor,
The imbalance of compensated line direct-to-ground capacitance, this method is easy to operate, is used widely in the power system, but actual motion
In, the method is difficult to the dynamic change of real-time tracking power grid, cannot accomplish the dynamic compensation of neutral point voltage.With power electronics
The development of technology can compensate low pressure and match using the IGBT composition that can be turned off from the static synchronous compensator of commutation bridge circuit
The neutral point displacement voltage that power grid three characteristics of the middle term laod unbalance generates is applied more and more extensively in compensation uncompensated load problem,
But in medium voltage distribution network operation, the main reason for three-phase imbalance is the unequal of line mutual-ground capacitor, and the method cannot
Overvoltage caused by inhibiting due to parameter unbalance over the ground.
Summary of the invention
The purpose of the present invention is, to by way of neutral point Injection Current, inhibited due to route control active inversion device
Parameter unbalance and the raised power network neutral point displacement voltage of neutral point displacement voltage caused by investment arc suppression coil have over the ground
The double-closed-loop control method that source inhibits.
The present invention passes through discharge resistance Rdc, charging capacitor CdcQuadergy is buffered, then through inverter and filter inductance L0Filter
Wave capacitor C0The filter circuit of composition forms single-phase alternating current, Ea、Eb、EcRespectively three-phase mains voltage；U0For neutral point
Move voltage；L,gLRespectively arc suppression coil tuning coil and loss conductance；IsFor the zero-sequence current of injection；K opens for single-phase high voltage
It closes；T is isolating transformer, no-load voltage ratio 1:1, Ca、Cb、CcFor each relatively capacitor of power distribution network；ga、gb、gcIt is respectively mutually let out for power distribution network
Leakage conductance, voltage transformer are open-delta voltage transformer, it is characterised in that: U0 *For the reference value of neutral point voltage, Is *
For the reference value of Injection Current；GPRFor the transmission function of ratio resonant controller；GPIFor the transmitting letter of pi controller
Number；KpwmFor the equivalent gain of inverter；U ' is the output voltage of inverter；ILFor the current value for flowing out filter inductance；L0、C0Point
Not Wei filter inductance and capacitance；RΣ=Ra//Rb//Rc//RLFor power network line leak resistance it is in parallel with loss resistance after
Equivalent resistance；CΣFor the sum of system direct-to-ground capacitance；IsFor the sampling Injection Current for flowing out filter circuit；GVIt (s) is to flow through filtering
Transmission function between the electric current and Injection Current of inductance, by filter capacitor, parameter partial pressure relationship is obtained over the ground with grid side:
It enables:
In formula: Gs(s) transmission function between Injection Current and neutral point displacement voltage, and have:
The transmission function of current inner loop are as follows:
In formula: GPI=KP+KI/ s, KP、KIThe respectively proportionality coefficient and integral coefficient of PI controller；
The transmission function of outer voltage are as follows:
In formula: GPR=KP+2KRωcs/(s2+2ωcs+ω0 2), wherein KP、KRThe respectively proportionality coefficient and resonance of PR controller
Coefficient, ωcFor cutoff frequency, ω0For resonance frequency.
The invention proposes a kind of double-closed-loop control methods of 66kV power network neutral point displacement voltage active quenching, pass through
Mode of the active inversion device to neutral point Injection Current is controlled, is inhibited due to line-to-ground parameter unbalance and investment arc blowout wire
Neutral point displacement voltage caused by circle increases, and double-closed-loop control is controlled using outer voltage PR, current inner loop PI control, voltage
Outer ring is control target with neutral point voltage, and current inner loop is control target with Injection Current, by the real-time of Injection Current
It adjusts, guarantees that the accuracy of Injection Current, validity realize effective inhibition to neutral point displacement voltage.The invention proposes
About the double-closed-loop control method of 66kV power network neutral point displacement voltage active quenching, controlled by outer voltage, current inner loop
Control is constituted, and traditional single close-loop control mode needs to calculate the ideal value of Injection Current as reference quantity, calculates Injection Current
Not only need to measure the parameter over the ground of each phase, but also when unusual fluctuation occurs for power distribution network generating system structure, parameter, it can not be quasi-
Really, it quickly responds, influences inhibitory effect.Use the method for double-closed-loop control active inversion device by being with neutral point voltage
Main inhibition target adjusts Injection Current amplitude and phase in real time, and can not only solving measurement, parameter bring is complicated over the ground
Problem, and increase the stability of control system is enable to respond quickly the variation of power grid parameter over the ground.
Detailed description of the invention
Fig. 1 is the topological diagram of active inversion device；
Fig. 2 is 66kV distribution network system figure；
Fig. 3 is simplified control system schematic diagram；
Fig. 4 is Double closed-loop of voltage and current block diagram；
Fig. 5 is Double closed-loop of voltage and current equivalent block diagram；
Fig. 6 a is two close cycles transmission function root locus diagram --- --- current inner loop transmission function root locus diagram；
Fig. 6 b is two close cycles transmission function root locus diagram --- --- outer voltage transmission function root locus diagram；
Fig. 7 is neutral point displacement voltage waveform before and after Injection Current；
Fig. 8 is reference current and Injection Current waveform；
Fig. 9 is the current waveform on the neutral conductor of Injection Current front and back；
Figure 10 is three-phase voltage waveform before and after Injection Current.
Specific embodiment
The present invention uses following steps:
(1) neutral point voltage and Injection Current are detected, target is controlled by outer voltage of neutral point voltage, is injected on the neutral conductor
Electric current be current inner loop control target.
(2) outer voltage uses PR adjuster, sets resonance frequency to the fundamental frequency of power grid, neutral point voltage is joined
Examining value is 0, and reference voltage and neutral point sample shift voltage adjust the reference current for exporting current inner loop through PR.
(3) current inner loop uses pi regulator, and being injected into the electric current on the neutral conductor through filter circuit is adopting for inner loop control
Sample electric current is injected into the neutral conductor after PI is adjusted with the reference current of outer ring output.
(4) active inversion device can make neutral point voltage not disconnecting after the continuous real-time adjusting of double-closed-loop control
Closely to reference quantity, being injected into the electric current on the neutral conductor through filter circuit at this time is optimal Injection Current.
(5) Injection Current compensates for before investment arc suppression coil system because of injustice over the ground caused by parameter unbalance over the ground
Weigh electric current, and arc suppression coil, which is equivalent to, at this time is short-circuited, and system is equivalent to be directly grounded state, and neutral point displacement voltage obtains effectively
Inhibit.
The topological diagram of active inversion device as shown in Figure 1, through uncontrollable rectifier rectification be direct current by three-phase alternating current source,
Pass through discharge resistance Rdc, charging capacitor CdcQuadergy is buffered, then through inverter and filter inductance L0Filter capacitor C0Composition
Filter circuit forms single-phase alternating current.This active inversion device is equivalent to forms a resistance between neutral point and the earth
Resist and achievees the purpose that inhibit asymmetrical voltage, while not by injecting zero-sequence current to neutral point for infinitely great current path
Change original earthing mode, so can be by its Approximate Equivalent at an amplitude and the controllable current source of phase.
Fig. 2 is 66kV systematic schematic diagram of the invention, Ea、Eb、EcRespectively three-phase mains voltage；U0For neutral-point displacement
Voltage；L,gLRespectively arc suppression coil tuning coil and loss conductance；IsFor the zero-sequence current of injection；K is single-phase high voltage switch；T
For isolating transformer, no-load voltage ratio 1:1, it can make electrical isolation between active inversion device and neutral point, guarantee former secondary side
Insulation performance inhibits displacement voltage by achieving the purpose that neutral point Injection Current；Ca、Cb、CcIt is respectively relatively electric for power distribution network
Hold；ga、gb、gcFor each phase scatter admittance of power distribution network, voltage transformer is open-delta voltage transformer in figure, passes through opening
The detection device at place judges fault type, after being determined as the raising of neutral point displacement voltage caused by three-phase imbalance, in detection
Property point voltage and Injection Current, neutral point voltage is set as outer voltage control target, is injected into the electric current on the neutral conductor as electricity
Inner-loop control target is flowed, modulated signal is generated by double-closed-loop control device and drives active inversion device switch-off, after adjusting
Injection Current by transformer corner connection side grounding transformer inject.
Fig. 3 is simplified system topological figure, it can be seen that respectively relatively parameter can be equivalent to grid side
CΣ=Ca+Cb+Cc, it is neutral point displacement voltage according to the main target that active inversion device inhibits, using outer voltage PR
Reference voltage is set as zero potential by control, and voltage to neutral is sampled, and resonance frequency is arranged to power grid fundamental frequency, has
Effect filters out the harmonic wave at non-fundamental frequency, by exporting reference current value and sample rate current after pi regulator to current inner loop, obtains
SPWM modulated signal controls switch-off in active inversion device, constantly regulate the amplitude and phase of Injection Current, effectively presses down
Neutral point displacement voltage processed.
Fig. 4 is Double closed-loop of voltage and current block diagram, and outer voltage is equal to 0 with neutral point voltage for control target, thus
Achieve the purpose that neutral point displacement voltage is inhibited to generate, outer voltage exports the reference value of current inner loop, the sampling of Injection Current
Signal realizes the real-time tracking to reference signal by PI controller.U0 *For the reference value of neutral point voltage, Is *For Injection Current
Reference value；GPRFor the transmission function of ratio resonant controller；GPIFor the transmission function of pi controller；KpwmFor inversion
The equivalent gain of device；U ' is the output voltage of inverter；ILFor the current value for flowing out filter inductance；L0、C0Respectively filter
Inductance and capacitance；RΣ=Ra//Rb//Rc//RLFor equivalent resistance of the power network line leak resistance after in parallel with loss resistance；CΣ
For the sum of system direct-to-ground capacitance；IsFor the sampling Injection Current for flowing out filter circuit；GV(s) be flow through the electric current of filter inductance with
Transmission function between Injection Current, by filter capacitor, parameter partial pressure relationship is obtained over the ground with grid side:
Due to the isolating transformer that system is 1:1 using no-load voltage ratio, RΣ、CΣ, value of the L after converting it is constant, so enable:
In formula: Gs(s) transmission function between Injection Current and neutral point displacement voltage, and have:
Simplified control block diagram is the transmission function of current inner loop shown in Fig. 5 are as follows:
In formula: GPI=KP+KI/ s, KP、KIThe respectively proportionality coefficient and integral coefficient of PI controller.
The transmission function of outer voltage are as follows:
In formula: GPR=KP+2KRωcs/(s2+2ωcs+ω0 2), wherein KP、KRThe respectively proportionality coefficient and resonance of PR controller
Coefficient, ωcFor cutoff frequency, ω0For resonance frequency.
For the double-closed-loop control method mentioned, herein with the resonance coefficient of the proportionality coefficient of PI controller and PR controller
As parameter, the root locus diagram of two close cycles transmission function, the influence according to Parameters variation to system performance, access control are drawn
The stability of system, as shown in Figure 6.Remaining control system parameter is as shown in table 1.
Due to the parameter K of current inner loopPPositioned at the G of its open-loop transfer functionPIKpwmG0Factor in, cannot directly use
The zero pole point of former open-loop transfer function draws root locus, need in closed loop transform function without KPItems removal, utilizes system
Equivalent open-loop transfer function draws root locus diagram.
1 control system parameter of table
According to root locus diagram as can be seen that the characteristic root of double closed-loop control system can be tested in the Left half-plane of the imaginary axis
Demonstrate,prove this system is stable, reasonable selection controller coefficient, so that it may meet the output response and its performance indicator of system.
Simulation analysis
For the validity for preferably verifying active suppressing method proposed in this paper, according to covering certain eastern actual ginseng of 66kV system for field
Number, the LGJ-240/30 model overhead transmission line of 51.6km and the LGJ-150/25 model overhead transmission line of 62.026km, 9.43km electricity
Cable is constituted, and overhead transmission line is sequentially A, B, C phase using vertical arrangement, and alternate geometry spacing is 2.5m, and C is utilized at a distance of ground 15m
Image method calculates each phase line parameter, and acquired results are as shown in table 2.
Each phase line parameter of table 2
66kV system power net, mains frequency 50Hz are established using Matlab emulation, DC side discharge resistance 10k Ω fills
Capacitor 0.047F, filter inductance 2mH, 100 μ F, LGJ-150/25 model overhead transmission line zero sequence resistance r of filter capacitor0=
0.336Ω/km；Zero sequence inductance L0=4.655mH/km；LGJ-240/30 zero sequence resistance r0=0.26 Ω/km；Zero sequence inductance L0=
4.61mH/km；Cable run r0=1.23 Ω/km；L0=1.67mH/km；General leak resistance is 20 times of direct-to-ground capacitance capacitive reactance
More than, emulation uses ga=gb=gc=2.5 × 10-5s。
After unbalance condition 0.05s occurs in system, investment active inversion device injects zero-sequence current to system, and Fig. 7 can
To find out, before putting into device, the peak value of neutral point displacement voltage nearly reaches 4kV, has exceeded the 5% of phase voltage, and three
Mutually uneven situation is quite serious, and after injecting zero-sequence current, neutral point voltage has been suppressed within 20V, inhibitory effect
Well.
Fig. 8 is the comparison waveform of Injection Current and reference current, it can be seen that Injection Current can rapidly, accurate tracking ginseng
Electric current is examined, control effect is good.
Fig. 9 is the zero-sequence current inhibited on the neutral conductor of front and back, and before 0.05s, the zero-sequence current on the neutral conductor is U0/(RL
+ j ω L), after 0.05s, due to first three asymmetric electric current relatively of the zero sequence current compensation investment arc suppression coil of injection, make
Arc suppression coil, which is equivalent to, to be short-circuited, so the electric current on the neutral conductor is exactly the zero-sequence current injected at this time.
Figure 10 is to inhibit front and back three-phase voltage simulation waveform, first three phase voltage of Injection Current is seriously uneven, the phase electricity of A phase
It is pressed with valid value ratio B phase and is higher by nearly 5kV, after Injection Current, three-phase voltage restores balance state, and power distribution network is each before and after Injection Current
Phase parameter comparison is shown in Table 3.
The comparison of 3 simulation result of table
Since there is the load factors such as some inevitable errors, such as route, transformer all can in simulation process
Keep emulation different with theory appearance, neutral point voltage can not be inhibited to 0, the Injection Current of output also has certain inclined with theoretical value
Difference, but deviation very little, and inhibiting rate is eliminated up to 98% or more because of neutral-point displacement caused by three-phase imbalance
Voltage can verify the correctness and feasibility for mentioning theoretical and control method.
Claims (1)
1. a kind of double-closed-loop control method of power network neutral point displacement voltage active quenching, passes through discharge resistance Rdc, charging electricity
Hold CdcQuadergy is buffered, then through inverter and filter inductance L0Filter capacitor C0The filter circuit of composition forms single phase ac
Electric current, Ea、Eb、EcRespectively three-phase mains voltage；U0For neutral point displacement voltage；L,gLRespectively arc suppression coil tuning coil with
Loss conductance；IsFor the zero-sequence current of injection；K is single-phase high voltage switch；T is isolating transformer, no-load voltage ratio 1:1, Ca、Cb、CcFor
The each relatively capacitor of power distribution network；ga、gb、gcFor each phase scatter admittance of power distribution network, voltage transformer is open-delta mutual induction of voltage
Device, it is characterised in that: U0 *For the reference value of neutral point voltage, Is *For the reference value of Injection Current；GPRFor ratio resonant controller
Transmission function；GPIFor the transmission function of pi controller；KpwmFor the equivalent gain of inverter；U ' is the defeated of inverter
Voltage out；ILFor the current value for flowing out filter inductance；L0、C0The respectively inductance and capacitance of filter；RΣ=Ra//Rb//
Rc//RLFor equivalent resistance of the power network line leak resistance after in parallel with loss resistance；CΣFor the sum of system direct-to-ground capacitance；IsFor stream
The sampling Injection Current of filter circuit out；GVIt (s) is the transmission function flowed through between the electric current of filter inductance and Injection Current, by
Parameter partial pressure relationship obtains filter capacitor over the ground with grid side:
It enables:
In formula: Gs(s) transmission function between Injection Current and neutral point displacement voltage, and have:
The transmission function of current inner loop are as follows:
In formula: GPI=KP+KI/ s, KP、KIThe respectively proportionality coefficient and integral coefficient of PI controller；
The transmission function of outer voltage are as follows:
In formula: GPR=KP+2KRωcs/(s2+2ωcs+ω0 2), wherein KP、KRThe respectively proportionality coefficient and resonance of PR controller
Coefficient, ωcFor cutoff frequency, ω0For resonance frequency.
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| CN111371110A (en) * | 2020-02-21 | 2020-07-03 | 江苏南自通华电力自动化股份有限公司 | Off-grid single-phase cascade photovoltaic energy storage hybrid system and control method thereof |
| CN111431161A (en) * | 2020-03-16 | 2020-07-17 | 杭州电力设备制造有限公司 | Neutral point voltage suppression and voltage arc extinction method and system based on active inversion split-phase injection |
| CN111697552A (en) * | 2020-06-08 | 2020-09-22 | 上海交通大学 | Voltage regulator-based arc suppression coil automatic tuning method and device |
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| CN111371110A (en) * | 2020-02-21 | 2020-07-03 | 江苏南自通华电力自动化股份有限公司 | Off-grid single-phase cascade photovoltaic energy storage hybrid system and control method thereof |
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| CN111431161B (en) * | 2020-03-16 | 2022-12-16 | 杭州电力设备制造有限公司 | Neutral point voltage suppression and voltage arc extinction method and system based on active inversion split-phase injection |
| CN111697552A (en) * | 2020-06-08 | 2020-09-22 | 上海交通大学 | Voltage regulator-based arc suppression coil automatic tuning method and device |
| CN111697552B (en) * | 2020-06-08 | 2021-05-28 | 上海交通大学 | Voltage regulator-based arc suppression coil automatic tuning method and device |
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